Posts tagged: WPA Cracking

Jan 06 2015

Wifiphisher – Fast Automated Phishing Attack Tool for WiFi Networks

wifiphisherWifiphisher is a security tool that mounts fast automated phishing attacks against WPA networks in order to obtain the secret passphrase. It is a social engineering attack that unlike other methods it does not include any brute forcing. It is an easy way for obtaining WPA credentials.

From the victim’s perspective, the attack makes use in three phases:

1] Victim is being deauthenticated from her access point: Wifiphisher continuously jams all of the target access point’s wifi devices within range by sending deauth packets to the client from the access point, to the access point from the client, and to the broadcast address as well.

2] Victim joins a rogue access point: Wifiphisher sniffs the area and copies the target access point’s settings. It then creates a rogue wireless access point that is modeled on the target. It also sets up a NAT/DHCP server and forwards the right ports. Consequently, because of the jamming, clients will start connecting to the rogue access point. After this phase, the victim is MiTMed.

MiTM Attack

3] Victim is being served a realistic router config-looking page: Wifiphisher employs a minimal web server that responds to HTTP & HTTPS requests. As soon as the victim requests a page from the Internet, wifiphisher will respond with a realistic fake page that asks for WPA password confirmation due to a router firmware upgrade.

― Kali Linux
― Two wireless network interfaces, one capable of injection.

Wifiphisher works on Kali Linux and is licensed under the MIT license.

More Info: sophron/wifiphisher – GitHub

Dec 29 2011

Reaver – WiFi Protected Setup Brute Force Attack Tool

Reaver implements a brute force attack against Wifi Protected Setup (WPS) registrar PINs in order to recover WPA/WPA2 passphrases, as described in

Reaver has been designed to be a robust and practical attack against WPS, and has been tested against a wide variety of access points and WPS implementations.

On average Reaver will recover the target AP’s plain text WPA/WPA2 passphrase in 4-10 hours, depending on the AP. In practice, it will generally take half this time to guess the correct WPS pin and recover the passphrase.

While Reaver does not support reconfiguring the AP, this can be accomplished with wpa_supplicant once the WPS pin is known.

Reaver targets the external registrar functionality mandated by the WiFi Protected Setup specification. Access points will provide authenticated registrars with their current wireless configuration (including the WPA PSK), and also accept a new configuration from the registrar.

In order to authenticate as a registrar, the registrar must prove its knowledge of the AP’s 8-digit pin number. Registrars may authenticate themselves to an AP at any time without any user interaction. Because the WPS protocol is conducted over EAP, the registrar need only be associated with the AP and does not need any prior knowledge of the wireless encryption or configuration.

Reaver performs a brute force attack against the AP, attempting every possible combination in order to guess the AP’s 8 digit pin number. Since the pin numbers are all numeric, there are 10^8 (100,000,000) possible values for any given pin number. However, because the last digit of the pin is a checksum value which can be calculated based on the previous 7 digits, that key space is reduced to 10^7 (10,000,000) possible values.

The key space is reduced even further due to the fact that the WPS authentication protocol cuts the pin in half and validates each half individually. That means that there are 10^4 (10,000) possible values for the first half of the pin and 10^3 (1,000) possible values for the second half of the pin, with the last digit of the pin being a checksum.

Reaver brute forces the first half of the pin and then the second half of the pin, meaning that the entire key space for the WPS pin number can be exhausted in 11,000 attempts. The speed at which Reaver can test pin numbers is entirely limited by the speed at which the AP can process WPS requests. Some APs are fast enough that one pin can be tested every second; others are slower and only allow one pin every ten seconds. Statistically, it will only take half of that time in order to guess the correct pin number.

Reaver is only supported on the Linux platform, requires the libpcap and libsqlite3 libraries, and can be built and installed by running:

$ ./configure
$ make
# make install

To remove everything installed/created by Reaver:

# make distclean

Usually, the only required arguments to Reaver are the interface name and the BSSID of the target AP:

# reaver -i mon0 -b 00:01:02:03:04:05

Download: reaver-1.3.tar.gz

Reaver Home: